High-pressure steam boiler for locomotives



'Oct. 9, 1928.

J. BUCHLI HIGH PRESSURE STEAM BOILER FOR LOCOMOTIVES Filed March 9,1-927 2 Sheets-Sheet l nnlililh 1 Ii Oct. 9, 1928.- 1,686,893

- J. BUCHLI HIGH PRESSURE STEAM BOILER FOR LOCOMOTIVES File'd March 9,1927 2 Sheets-Sheet 2 VII/II [I I/III 4 Patented Oct. 9, 1928."

UNITED STATES I 1,686,893 PATIENT oFF-I-CE.

JACOB BUG HLI, OF.WINTERTI- IUR, SWITZERLAND.

HIGH-PRESSURE STEAM BOILER LOCOMOTIVES.

Application filed March 9, 1927, Serial No. 174,079, and in GermanyApril 14, 1926.

of principal importance that the tubes are simple to manufacture, thatthey form a tight obturation against the outside, that they may '10 beeasily and rigidly connected and readily cleaned.

The subject matter of the present invention is a watertube fireboxcomprising upper drums and lower drums, a front wall and a rear wall,and tube elements connecting the upper drums to the lower drums andforming the roof and the lateral walls of the combustion chamber andconsisting of several parts welded together to a fork shape.

In order to obtain the necessary direct heating surface in boilers oflarge output and yet to keep within the profile of the maximum fixedstructure two upper drums must be used, so that the height of thefirebox is not too small and in order to provide for the necessarycross-section of the combustion chamber. The tube elements consist ofthree vertical tubes, each beaded into a lower drum. These verticaltubes form the lateral walls of the firebox and an intermediatepartition wall, and of the horizontal tube comprising two partsalternately connected to one of the two upper drums, the vertical andthe horizontal parts of each element being connected with each other bymeans of three connect.- ing pieces provided with openings for cleaningthe tubes. The tube elements are thus fork shaped having three prongspointing in the downward direction whereby the horizontal parts of theelement protect the upper drums in a known manner against the directaction of the fire gases.

By this arrangement the required height of the firebox is obtained andthe firebox may motive if it is required in view of obtainbe made widerthan the frame'of the 1000- drumand the connection between a horizontaland a'vertical'part of a tube element,

Figs. 4' and 5 show in detail in a section and in a sideview'thecross-piece illustrated inFig.3.

Referring now to the drawings the upper drums 1 and 2 are connected tothe lower drums 3, 4.11mi 5 by means ofthe fork shaped tube elements 6having three prongs. In the front and at the rear the firebox isclosedby the walls 7 and 8 respectively. In the lower part of the firebox thegrate 9 is arranged. The vertical parts (prongs) 10, 11 and 12 of thetube elementsare beaded into the respective lower drums 3, 4 and 5 andare connected to each other and to one or the other of the upper drumsby the horizontal part 13. The connection between the vertical and thehorizontal parts of the tube elements is effected by meansofcross-pieces 14 and 15 which permit the beading and an easy cleaning.The tubes 11 beaded into the intermediate lower drum 4divide thecombustion space into the symmetrical halves, each ofwhich is providedwith aseparate fire-door 16 or 17 respectively.

In Figs. 3-5 the connection between the horizontal part 13 and thevertical part 10 of a tube element 6 by means of a cross-piece 14 isshown in detail. The branches 18 and 19 to be connected to the tubes 13and 10 are provided with screw. threadin order to obtain a rigidconnection between branches and tubes and the ends of the tubes screwedto the branches are welded to the latter at 20 and 21 respectively inorder to obtain a steam 1 A locomotive boiler, comprising incombination, a pair of upper drums, lower drums, and a fireboxcomprising a front wall, a rear wall, and a plurality of fork shapedwater tube elements arranged close together longitudinally of thelocomotive boiler and forming the lateral walls and the roof of thefire- 7 box to protect the upper drums and an inter mediate wall insidethe latter, said fork shaped tube elements consisting of three verticaltubes beaded into the lower drums and of a horizontal tube connectingsaid vertical tubes together, the horizontal tube of each tube elementbeing provided with a single vertical branch and said b 'anches beingalternately headed into said upper drums.

2. A locomotive boiler, comprising in combination, two upper drums,three lower drums, and a fire box comprising a front Wall, a rear Wall,and a plurality of fork shaped water tube elements closely arranged onebehind the other in the longitudinal 'direction of the locomotive boilerand forming the lateral walls and the roof of the firebox, said roofprotecting the upper drums and an intermediate wall inside the latter,said fork shaped tube elements consisting of three vertical tubes beadedinto the three lower drums and of a horizontal tube connected to theupper ends of said vertical tubes by means of cross pieces to thesockets of which said tubes are screwed as Well as welded, the remainingsockets being closed by screw caps for permitting a convenient cleaningof the tubes, and the horizontal tube of each tube element beingprovided with a. vertical branch consisting of three vertical tubularparts beaded at their lower ends intothe lower drums and withtheir-upper ends connected to a horizontal part arranged belowandconnected to said upper drums and forming the roof of the fire-box andprotecting the upper drums against the action of the tire gases.

4. In a high pressure locomotive boiler, a fork-shaped water tube unitcomprising a transverse upper water tube and threewater j tubesextending downwardly therefrom, said transverse tube havlng a removableclosure at each end for the through passage of a cleansing tool, and thevertical tubes having removable closures at their upper ends. t

In testimony whereof, I have signed my name to this specification.

JACOB BUCHLI.

